%==============================================================================
%
% PT20:XXX-SYSTEM-IO.RED - 20 specific IO routines for PSL
%
% Author: Modified by Robert R. Kessler and MLG
% From System-io.red for the 20 by Eric Benson
% Computer Science Dept.
% University of Utah
% Date: Modified 16 August 1982
% Original Date 16 September 1981
%
% Copyright (c) 1982 University of Utah
%
%==============================================================================
ON Syslisp;
% Each individual system must have the following routines defined.
% SysClearIo, SysOpenRead, SysOpenWrite, SysReadRec, SysWriteRec, SysClose,
% SysMaxBuffer
%
% The following definitions are used in the routines:
% FileDescriptor - A machine dependent word that references a file once
% opened.
% FileName - A Lisp string of the file name.
%
% ---------- SysClearIo:
% called by Cleario for system dep extras
lap '((!*entry SysClearIO expr 0)
%
% ^C from RDTTY and restart causes trouble, but we don't want a full RESET
% (don't want to close files or kill forks), so we'll just do the
% part of RESET that we want, for terminal input
%
(!*MOVE (WConst 8#100) (reg 1)) % .priin
(rfmod)
(tro 2 2#001111100001000000) % tt%wak + tt%eco + .ttasi, like RESET
(sfmod)
(!*EXIT 0)
);
syslsp procedure SysOpenRead(Channel,FileName);
% % Open FileName for input and
% % return a file descriptor used
% % in later references to the
% % file.
Dec20Open(FileName,
% gj%old gj%sht
2#001000000000000001000000000000000000,
% 7*of%bsz of%rd
2#000111000000000000010000000000000000);
%/ later... if JFN eq 0 then return ContOpenError(FileName, 'INPUT);
syslsp procedure SysOpenWrite(Channel,FileName);
Dec20Open(FileName,
% gj%fou gj%new gj%sht
2#110000000000000001000000000000000000,
% 7*of%bsz of%wr
2#000111000000000000001000000000000000);
%/ if JFN eq 0 then return ContOpenError(FileName, 'OUTPUT);
lap '((!*entry Dec20Open expr 3)
%
% Dec20Open(Filename string, GTJFN bits, OPENF bits)
%
(!*WPLUS2 (reg 1) (WConst 1)) % increment r1 to point to characters
(hrli (reg 1) 8#440700) % turn r1 into a byte pointer
(!*MOVE (reg 1) (reg 4)) % save filename string in r4
(!*MOVE (reg 2) (reg 1)) % GTJFN flag bits in r1
(!*MOVE (reg 4) (reg 2)) % string in r2
(gtjfn)
(!*JUMP (Label CantOpen))
(!*MOVE (reg 3) (reg 2)) % OPENF bits in r2, JFN in r1
(openf)
CantOpen
(!*MOVE (WConst 0) (reg 1)) % return 0 on error
(!*EXIT 0) % else return the JFN
);
syslsp procedure SysReadRec(FileDescriptor,StringBuffer);
% % Read from the FileDescriptor, a
% % record into the StringBuffer.
% % Return the length of the
% % string read.
Begin scalar N,Ch;
N:=0;
Loop: Ch:=Dec20ReadChar(FileDescriptor);
StrByt(StringBuffer,N):=Ch;
If Ch eq Char EOL or Ch eq Char EOF then return N;
N:=N+1;
% Check buffer size here
goto Loop;
End;
lap '((!*entry Dec20ReadChar expr 1)
Loop
(bin) % read a character
(erjmp CheckEOF) % check for end-of-file on error
(!*JUMPEQ (Label Loop) (reg 2) (WConst 0))% try again if it's null char
(!*JUMPEQ (Label Loop) (reg 2) (WConst 8#15))% or carriage return
(!*MOVE (reg 2) (reg 1)) % move char to reg 1
%/ (camn (reg nil) (fluid !*ECHO)) % is echo on?
(!*EXIT 0) % no, just return char
%/ (!*PUSH (reg 1)) % yes, save char
%/ (!*CALL WriteChar) % and write it
%/ (!*POP (reg 1)) % restore it
%/ (!*EXIT 0) % and return
CheckEOF
(gtsts) % check file status
(tlnn (reg 2) 2#000000001000000000) % gs%eof
(!*JUMP (Label ReadError))
(!*MOVE (WConst 26) (reg 1)) % return EOF char
(!*EXIT 0)
ReadError
(!*MOVE (QUOTE "Attempt to read from file failed") (reg 1))
(!*JCALL IoError)
);
syslsp procedure SysWriteRec (FileDescriptor, StringToWrite, StringLength);
% % Write StringLength characters
% % from StringToWrite from the
% % first position.
for i:=0:StringLength do
Dec20WriteChar(FileDescriptor,strbyt(StringToWrite,i));
lap '((!*entry Dec20WriteChar expr 2)
% Jfn,Chr
(!*JUMPEQ (Label CRLF) (reg 2) (WConst 8#12)) % if LF, echo CRLF
(bout) % no, just echo char
(!*EXIT 0) % return
CRLF
(!*MOVE (WConst 8#15) (reg 2)) % write carriage-return
(bout)
(!*MOVE (WConst 8#12) (reg 2)) % write linefeed
(bout)
(!*EXIT 0) % return
);
% SysClose (FileDescriptor); % Close FileDescriptor, allowing
% % it to be reused.
lap '((!*entry SysClose expr 1)
(closf)
(!*JUMP (Label CloseError))
(!*EXIT 0)
CloseError
(!*MOVE (QUOTE "Channel could not be closed") (reg 1))
(!*JCALL ChannelError)
);
syslsp procedure SysMaxBuffer(FileDesc);
200;
End;